Exhaust mechanism for explosive-engines.



PATENTED MAR. 3, 1908.

J. M. & E. E. TRUSGOTT. EXHAUST MECHANISM FOR BXPLOSIVE ENGINES.

APPLIGAT ION FILED MAR.15, 1906.

TIIIIIIIlIl/I UNITED STATES PATENT OFFICE.

JAMES M. TRUSCOTT AND EDWARD, E.

TRUSCOTT, OF ST. JOSEPH, MICHIGAN, ASSIGNORS TO TRUSCOTT BOATMANUFACTURING COMPANY, OF ST. JOSEPH, MICHIGAN, A CORPORA- TION OFMICHIGAN.

EXHAUST MECHANISM FOR EXPLOSIVE-ENGINES.

Specification of Letters Patent.

Patented March 3, 1908.

Application filed March 15. 1906. Serial No. 306.145.

To all whom it may concern:

Be it known that we, JAMEs M. TRUSCOTT and EDWARD E. Tnusoor'r, citizensof. the United States, residing at St. Joseph, in the county of Berrienand State of Michigan, have invented new and useful Improvements inExhaust Mechanism for Explosive-Engines, of which the following is aspecificatron.

Our present invention relates to certain new and useful improvements inexhaust mechanism for explosive engines, and more especially to exhaustmechanism of the submerged or underwater type, such as is associatedwith explosive engines mounted upon motor boats or launches.

It is the prime object of the invention to provide a novel constructionof exhaust mechanism of the character referred to that will materiallysilence the exploded charges during the exhaust operation and at thesame time prevent back-pressure in the engine cylinders.

With the above objects in view, the invention comprises, in the formherein shown, exhaust mechanism of the character stated in which theexhaust pipe from the engine cylinder communicates with, and dischargesinto, an expansion tank or chamber that may or may not be partiallyfilled with water, said tank having a pipe or passage opening throughthe hull of the boat below the water line at any suitable point alongthe side or bottom thereof, and disposed in such manner that during thetravel of the boat through the water a continuous suction or pull willbe exerted through the pipe or passage and on the contents of the tankwhereby to effect a complete and practically noiseless under-waterexhaust of the exploded gases, such as will prevent backpressure in theengine.

In the accompanying drawing which is illustrative of one embodiment ofour invention, Figure 1 is a side elevation, partly in section, of amotor boat, showing the application of our improved exhaust mechan- 1smto an explosive engine of ordinary construction; Fig. 2 is a sideelevation, partly in section, of the discharge pipe and casing. Fig. 3is a section on the line 22 of Fig. 2 and Fig. 4 is a plan view lookingtoward the rear of the discharge pipe and casing.

In the special construction illustrated, and

which is one of the many arrangements that may be employed in carryingout the spirit of the invention, the reference numeral 1 designates thehull of an ordinary pleasure craft; 2 an explosive motor carriedthereby, and 3 the exhaust pipe for the motor. This exhaust pipe 8communicates with and discharges into an expansion tank or chamber 4,located in the boat 1, preferably, but not necessarily in such mannerthat the water line extends about centrally of the tank.

In the arrangement shown, the exhaust pipe 3 discharges into andcommunicates with one end of the tank 4, and leading from the oppositeend of the tank is a discharge pipe or passage 5, theconstruction.illustrated having a return bend 6, the open end of which is incommunication with a hollow casing 7 secured to the hull of the boat onthe exterior thereof, said casing being relatively fiat and broad andhaving an imperforate cover-plate 8 and a wide-mouthed opening 9,disposed toward or facing the stern of the boat, and located below thewater line. The expansion tank is preferably, but not necessarilynormally partially filled with water as shown, so that when the explodedor exhausted charges from the engine are discharged therein they will becushioned and become instantly cooled and expanded. By locating the tank4 partially below the Waterline, water will enter therein immediatelythe boat is placed in the river or other body of water.

By reason of the construction and arrangement of the opening 9, in thenozzle or casing, and the return bend 6, both of which are disposedtoward the stern of the boat, it will be apparent that as the boat ispro pelled through the water, the rush of water over the cover plate 8,and past the opening 9, will cause a continuous suction or pull to beexerted through the 5, and on the contents of the tank, such as willinsure a complete and continuous discharge of the exhausted and expandedgases in the tank, the action of the parts described being in the natureof an aspirator.

By referring to the drawing it will be seen that the casing 7 is arelatively thin hollow body that lies practically flat against the sideor bottom of the boat, the closed end gradually tapering to nothing atthe point where it merges into the marginal attaching flange 10. By thisconstruction it will be obvious that there are no abrupt projectionssuch as would offer resistance to the free 1 passage of the boat throughthe water, and this is a feature of considerable importance inunderwater structures of this kind. The form of exhaust mechanism shownalso renders it possible to provide, in a simple and effective manner,for the discharge of the water from the cooling jacket of the engine. Toaccomplish this end we tap the cooling jacket 12, as shown, with a shortpipe or nipple 13, the free end of which discharges directly into theexhaust pipe 3, so that the cooling water after having passed throughthe jacket, is discharged into the exhaust pipe, partially cooling theexhausted charges, and then flowing with the latter into the expansiontank 4, from whence they are sucked or pulled out through the returnbend 6, into the water in an obvious manner.

In the showing herein made we have illustrated only one form of theinvention, by way of example, recognizing that modifications of thearrangement will readily suggest themselves to those skilled in the art,and we do not therefore, wish to be understood as limiting ourselves tothe precise construction shown, except as we shall be limited by thescope of the appended claims.

It will be apparent that exhaust mechanism of the character herein shownmay be applied to explosive or expansive motors of all types, whether ofthe reciprocatory or rotary piston class, and we do not, therefore, wishto limit ourselves to the application of the invention to any particularkind of motor. Neither do we wish to be understood as limiting ourselvesto the particular location of the expansion tank as herein shown, for itwill be obvious that the tank or chamber may be otherwise located orpositioned without departing from the true spirit of the invention,although advantages result from locating the tank partially below thewater-line, in that immediately the boat is placed in the water the tankwill become partially filled, and the water therein then acts as acushion for the exploded charges and also serves to cool and expand suchcharges.

hat we claim and desire to secure by Letters Patent is 1. In combinationwith a boat having an explosive motor thereon, under water exhaustmechanism for the motor consisting of a nozzle comprising a hollowcasinghaving a wall secured to the hull of a boat and an imperforatewall spaced therefrom and oining said first wall at three sides only toprovide a chamber whose only outlet is directed to ward'the stern of theboat, and an expansion chamber having communication with the motorexhaust and with the said nozzle.

2. In combination with a boat having an explosive motor thereon, underwater exhaust mechanism for the motor consisting of a nozzle comprisinga hollow casing having a substantially flat wall attached to the hull ofthe boat below the water line and an imperforate wall arched over saidflat wall, said imperforate wall being removed from the flat wall toprovide an opening at one end only of the casing and joined thereto atits opposite end, and a pipe leading from the space between the saidwalls and communicating with the exhaust pipe of the motor.

3. In combination with a boat having an explosive motor mounted thereon,exhaust mechanism for the motor, comprising an expansion tank havingcommunication with the exhaust pipe of the motor, a part of said tankbeing located below the water line, and an outlet pipe leading from thetank and extending through the bottom of the boat below the water linethereof, the discharge end of said outlet pipe being free and unolstructed and directed toward the stern of the boat.

4. I11 combination with a boat having an explosive motor mountedthereon, exhaust mechanism for the motor, comprising an expansion tankhaving open communication at one end with the exhaust pipe of the motor,a part of said tank being located below the water line, and an outletpipe leading from the opposite end of the tank and discharging outsideof the boat below the water line thereof, the free end of said outletpipe being directed toward the stern of the boat.

5. In combination with a boat having an explosive motor mounted thereon,exhaust mechanism for the motor, comprising an expansion chamber havingcommunication with the motor exhaust, and an aspirating nozzleconsisting of a hollow casing provided with means whereby it may besecured to the bottom of the boat below the water line and having asingle outlet opening directed rearwardly, the outer wall of the nozzlebeing imperlorate, and a pipe connection between the nozzle and theexpansion chamber. p

6. In combination with a.boat having an explosive motor thereon, anunder water aspirator for the motor exhaust, comprising a nozzleconsisting of a hollow casing secured to the side of the boat below thewater line, said nozzle having an imperforate outer wall and a singleoutlet opening directed toward the stern of the boat, and a pi e havingcommunication with the said nozz e and with the motor exhaust.

7. In combination witha boat having an explosive motor thereon, exhaustmechanism for the motor, comprising an expansion chamber havingcommunication with the motor exhaust, a portion of said chamber beingbelow the water line of the boat, a relatively broad and fiat hollowcasing secured to the outside of the boat below the water line andhaving a rearwardly directed opening, and a rearwardlycurved pipeleading from the expansion chamber to said hollow casing.

8. An exhaust-nozzle of the character described comprising a hollowcasing having a substantially flat wall adapted to be attached to a wallof a boat and an imperforate wall arched over said. flat wall, saidimperforate wall being removed from the flat wall to provide an openingat one end of the casing and 'oined thereto at its opposite end, and apipe leading from the flat wall and having com munication with the spacebetween the two walls.

9. An exhaust nozzle of the character described comprising asubstantially flat rear Wall and an imperforate front wall arched overone facev thereof and joined thereto at the sides and at one end only,the opposite end being removed from the rear wall to provide an openingat said end that communicates with the space formed between the twowalls and a pipe leading from the outer face of the rear wall andcommunicating with said space.

10. An exhaust-nozzle of the character described comprising asubstantially fiat rear wall and an imperforate front wall substantiallyparallel therewith and oined thereto at the sides and at one end only,the opposite end being separated from the rear wall to provide anopening at said end that communicates with the space between the twowalls, and a curved pipe extending tangentially from the outer face ofthe rear wall and communicating with the said space.

1.1. An exhaust nozzle of the character described comprising a hollowcasing having a wall adapted to be secured to the hull of a boat and asecond wall spaced therefrom and joining said first wall at three sidesonly to provide a chamber open at one end, and an exhaust pipe havingcommunication with said chamber.

In testimony whereof We have hereunto set our hands in presence of twosubscribing Witnesses.

JAMES M. TRUSCOTT. EDWARD E. TRUSCOTT.

"Witnesses: a

H. E. KEMiToH, MILo SELTER.

